Some Types of Dinoflagellates (Single-Celled Eukaryotes) Are Photosynthetic

question 13

Multiple Choice

Some types of dinoflagellates (single-celled eukaryotes) are photosynthetic. They have flagella and can swim through the water. If you grow them in a container that is lit from the right side, the cells will swim to the right side of the container. Is this an example of orientation? Why or why not?

• A)No, because orientation is a type of behavior only shown by multicellular organisms.
• B)No, because this is random behavior and orientation involves a directed response.
• C)No, because orientation involves a response to a stimulus, and there is no stimulus in this example.
• D)Yes, because there is a change in location in response to environmental information.
• E)Yes, because there is movement involved, and movement always involves orientation.

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